1" gatling

A few days ago, the auctions ended on “munitionauktion.de
There was an 1" gatling in good conditions for sale and the auction finish at 633$. A few years ago on this forum, someone told me that these cartridges are not rare, so is it the price you will pay for this cartridge?
I bought the 1" gatling canister load for 303$ but it was 10 years ago. Which one is the rarest?

About five years ago I bought a 1" gatlin with regular lead bullet for $75 at a gun show. He also had one with buck & ball for $300. It came with an ex ray showing the buck shot inside the shell.

So it seems that the price are nearly the same for the canister load last 10 years, hope it’s the same for the standart load.